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Method for preparing soluble potassium fertilizer by decomposing potassium feldspar

A potassium feldspar and soluble technology, applied in potash fertilizers, inorganic fertilizers, fertilization devices, etc., can solve problems such as high calcination temperature, low potassium conversion rate, and poor wettability, so as to reduce calcination temperature, increase conversion rate, and improve wettability. wet effect

Inactive Publication Date: 2019-01-04
河南省滋源肥业科技开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] At the present stage, the technology of preparing soil improvement materials in the form of potassium calcium magnesium fertilizer or potassium calcium magnesium phosphate fertilizer by calcination by using potassium feldspar, adding additives and fuel carbon, the calcination temperature is high, and the potassium conversion rate of potassium feldspar is low; In the condition of acid medium, the production process of decomposing potassium feldspar at low temperature with the help of hydrofluoric acid and sodium hydroxide and other co-solvents has strong corrosiveness of additives, expensive raw materials, serious equipment loss, and low potassium conversion rate of potassium feldspar decomposition. and other shortcomings
At the same time, the meltability of the flux in the fluxing process is poor, and the melting and decomposition are not uniform

Method used

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  • Method for preparing soluble potassium fertilizer by decomposing potassium feldspar
  • Method for preparing soluble potassium fertilizer by decomposing potassium feldspar
  • Method for preparing soluble potassium fertilizer by decomposing potassium feldspar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Preliminarily crush the materials potassium feldspar and flux to less than 10mm respectively;

[0060]In terms of weight percentage, 20% to 30% of potassium feldspar is taken, and the following fluxes are added to the rest: one or more of boric acid or borax ore (Na2B4O7·10H2O) for 10 to 10% 30%, dolomite (calcium magnesium carbonate) and / or serpentine (magnesium-rich silicate ore) 10% to 45%, anhydrous calcium chloride 8% to 50% and / or calcium sulfate 14% to 32% , one or more of potassium carbonate, potassium bicarbonate and potassium chloride or potassium sulfate 2% to 15%, sodium fluoride and / or calcium fluoride or fluorite 0 to 25% (optimally 0.5 to 5%) ), coal or coke 5%; further pulverize the mixed potassium feldspar and the above-mentioned additives into a uniform powder of 100 mesh to 320 mesh; add one or A variety of water and an appropriate amount of water, with the appropriate amount of agglomeration to form particles without dispersing and particles not sti...

Embodiment 2

[0062] Preliminarily crush the materials potassium feldspar and flux to less than 10mm respectively;

[0063] Measured by mass weight percentage, take 40% to 70% of potassium feldspar, and add the following flux: boronite ore (Ca2B6O11·3H2O), boronite ore (Mg2B2O5·H2O), boronite ore (CaMgB6O11· 6H2O) and boron maficite ore [(Mg, Fe)2Fe(BO3)O2] one or more 10%; calcium oxide or calcium carbonate (limestone) and / or calcium bicarbonate 5% ~ 20%, white cloud Stone and / or serpentine 5%-10%, magnesium chloride and / or magnesium sulfate 7%-10%, one or more of sodium carbonate, sodium bicarbonate, sodium chloride and sodium sulfate 5%-10%, Phosphate rock (calcium fluorophosphate (Ca5(PO4)3F) and / or phosphogypsum 0-25% (optimally 0.5-5%), sawdust, forestry thinning wood, waste wood branches and leaves, seed shells, straw ( One or more of such as rice, wheat, corn, cotton, etc.), waste paper and agricultural product processing solid residues, the amount is preferably equivalent to 10% o...

Embodiment 3

[0067] Preliminarily crush the materials potassium feldspar and flux to less than 10mm respectively;

[0068] Measured by weight percentage, take 30% to 50% of potassium feldspar; add the following flux: boron natural minerals such as sodium borate ore [NaCa[B5O7(OH)4]·6H2O], boron-containing compounds such as diboron trioxide Or boric acid or borax, and one or more of borax 5%; dolomite and / or serpentine 10% to 40%, one or more of sodium carbonate, sodium bicarbonate or sodium chloride and sodium sulfate A total of 5% to 25% of the total amount of livestock and poultry solid waste is equivalent to 10% of coke or coal; the above-mentioned mixed materials are further pulverized into a uniform powder of 100 mesh to 320 mesh; the weight ratio of 5% to 8% One or more of hydrochloric acid, sulfuric acid, and phosphoric acid and an appropriate amount of water are used to granulate the uniformly mixed powder of the above-mentioned potassium feldspar and flux to prepare acidic potassi...

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Abstract

The invention provides a method for preparing a soluble potassium fertilizer by decomposing potassium feldspar. Raw materials comprise potassium feldspar and a fluxing agent mainly containing alkali metal or alkaline earth metal, and the fluxing agent further contains boron compounds or boron-containing natural minerals. The method comprises the steps that the materials of potassium feldspar and the fluxing agent are preliminarily crushed to be 10 mm or below separately, wherein by weight, the content of potassium feldspar is 20-70%, and the balance fluxing agent is added; the mixed potassiumfeldspar and fluxing agent are crushed to be 100-320 mesh and uniformly mixed, and uniformly-mixed powder is sprayed to a high-temperature furnace and calcined at 750-1,000 DEG C for 30-80 minutes; then a calcined product is cooled to the room temperature and uniformly ground to obtain the potassium fertilizer containing boron and alkali metal or alkaline earth metal.

Description

technical field [0001] The invention relates to the technical field of extraction and manufacture of potassium fertilizer, in particular to a method for extracting soluble potassium fertilizer by decomposing potassium feldspar. Background technique [0002] Potassium is one of the important nutrients necessary for the growth of crops. The distribution of water-soluble potassium resources in my country is very uneven. When it is seriously scarce, the water-insoluble potassium-containing potassium feldspar resources are very rich. The chemical structure of potassium feldspar is K(AlSi 3 o 8 ), the network structure composed of Si-Al-O framework is extremely stable, so the potassium contained in it is not easy to release, so it cannot be directly absorbed by crops. Therefore, the comprehensive and efficient utilization of water-insoluble potassium feldspar resources is a major demand for the development of my country's agricultural industry, and it is of great significance t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05D1/04
CPCC05D1/04
Inventor 宋吉青白文波
Owner 河南省滋源肥业科技开发有限公司